sysconf: use getrlimit to determine ARG_MAX
sysconf: use getrlimit to determine ARG_MAX

getrlimit previously was only called for NPTL (why?), fix that to be
used everywhere.

Signed-off-by: Bernhard Reutner-Fischer <ce1ac9e9ad16abccd7821f371ad381197b4768ac@gmail.com>

ffainelli/uClibc,hwoarang/uClibc,czankel/xtensa-uclibc,waweber/uclibc-clang,kraj/uClibc,foss-xtensa/uClibc,ffainelli/uClibc,groundwater/uClibc,majek/uclibc-vx32,brgl/uclibc-ng,wbx-github/uclibc-ng,majek/uclibc-vx32,ffainelli/uClibc,foss-for-synopsys-dwc-arc-processors/uClibc,foss-xtensa/uClibc,czankel/xtensa-uclibc,waweber/uclibc-clang,kraj/uclibc-ng,skristiansson/uClibc-or1k,waweber/uclibc-clang,skristiansson/uClibc-or1k,skristiansson/uClibc-or1k,wbx-github/uclibc-ng,hjl-tools/uClibc,foss-for-synopsys-dwc-arc-processors/uClibc,waweber/uclibc-clang,ddcc/klee-uclibc-0.9.33.2,czankel/xtensa-uclibc,kraj/uclibc-ng,foss-xtensa/uClibc,foss-xtensa/uClibc,mephi42/uClibc,ffainelli/uClibc,groundwater/uClibc,majek/uclibc-vx32,foss-for-synopsys-dwc-arc-processors/uClibc,brgl/uclibc-ng,hwoarang/uClibc,groundwater/uClibc,mephi42/uClibc,kraj/uClibc,kraj/uClibc,hjl-tools/uClibc,kraj/uclibc-ng,czankel/xtensa-uclibc,foss-for-synopsys-dwc-arc-processors/uClibc,kraj/uclibc-ng,hwoarang/uClibc,ddcc/klee-uclibc-0.9.33.2,skristiansson/uClibc-or1k,ddcc/klee-uclibc-0.9.33.2,brgl/uclibc-ng,hwoarang/uClibc,mephi42/uClibc,groundwater/uClibc,majek/uclibc-vx32,hjl-tools/uClibc,mephi42/uClibc,wbx-github/uclibc-ng,wbx-github/uclibc-ng,groundwater/uClibc,ddcc/klee-uclibc-0.9.33.2,kraj/uClibc,ffainelli/uClibc,brgl/uclibc-ng,hjl-tools/uClibc,hjl-tools/uClibc